See also the List of all resources and the resource category.
Page 31, Column 2, Paragraph(s) 7, Core Rule Book
Resource: A Runner card type that is installed and grants the Runner various benefits.

Resources are a type of card that the Runner can install in his/her rig. They are slightly more risky cards because they can be trashed by the Corporation when the Runner is tagged, but they tend to have powerful abilities and effects.

Page 10, Column 2, Paragraph(s) 4-6, Core Rule Book

Resources are a wide variety of connections, assets, and skills that aid the Runner.

The Runner installs resources in his rig by paying an install cost.

There is no limit to the number of resources the Runner can install in his rig.

When the Runner is tagged, resources may be trashed by the Corporation.

Page 15, Column 2, Paragraph(s) 4-5, Core Rule Book
To install a resource, the Runner pays the resource's install cost and places it in his resource row.

There is no limit to the number of resources a Runner can have installed.

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